Question

why does Hydrogen provide a special position in modern periodic table??

Answer 1

Hydrogen is considered as a very unique element. The position of this small element in the periodic table is debatable.

Hydrogens position was not justified in the very old Mendeleevs periodic table. He positioned hydrogen in the first column above alkali metals. He did so because hydrogen and alkali metals have similar properties. For example, hydrogen reacts with halogens, oxygen, and sulphur to form compounds whose formulae are similar to those of alkali metals.

Hydrogen also resembles halogens in many ways. Like halogens, hydrogen is a gas, and exists as a diatomic molecule (H2). It forms covalent compounds like halogens unlike alkali metals. Hence, it can also be placed above the halogen group.

THESE PROPERTIES LEAD TO THE UNEXPLAINED POSITION OF HYDROGEN

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Answer 2

Hydrogen is provided a special position in the periodic table because it is still a controversy whether to place it in the halogen group or in the alkali metal group because it exhibits properties of both halogens and alkali metals.
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